package com.chixing.day19_thread;

public class Singleton {
    public static void main(String[] args) {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("s");
        stringBuilder.reverse();
        stringBuilder.toString();

        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append("s");
        stringBuffer.reverse();
        stringBuffer.toString();
    }
}
